15-year-old Anastasia Zagitova's performance in the team competition freestyle skate led Russian Federation to a silver medal; now the young athlete is projected to rival her teammate Evgenia Medvedeva for gold in the individual competition.
Osmond, who was third after the short program, skated to "Swan Lake" and "Black Swan" and held off Miyahara to make the podium.
Now, she heads home with Olympic gold, the first for the Russians at the Pyeongchang Olympics.
"I don't go out there to prove something to someone", said Zagitova, who won the short program with a world-record score. That ended the gold drought for the Olympic athletes from Russian Federation, the designation given to the nation's competitors after the IOC banned Russian Federation because of a doping scandal.
Medvedeva actually had two triple-triple combinations in her routine - a triple flip-triple toe loop and a triple salchow-triple toe loop - but neither one was worth as many points as Zagitova's combination.
The 23-year-old has been in exceptional form throughout the Games so far, winning two gold medals for his efforts on the ice.
Italy's Carolina Kostner, the 2014 Olympic bronze medalist, is already the grand old lady of figure skating-at 31.
17-year-old Kaori Sakamoto finished 6th with for her Winter Olympic debut. Whether she can follow up this triumph with more - unlike 2014 victor, Russia's Adelina Sotnikova, who has struggled since - will be fascinating to watch.
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She nailed everything with fluid flair and technical brilliance. So, what was it about Zagitova's short program that gave her the edge over Medvedeva in it? "I don't know whether I'll be able to achieve the same success but I know very well if I manage to do it right then why not?"
Team USA: National champion Bradie Tennell has been lucky enough to have her breakout season in an Olympic year.
Medvedeva looked every bit the golden girl in posting a world-record short program score of 81.06 in the team competition.
Nagasu, fourth at the Vancouver Games in 2010, became the first American woman to land that 3 1/2-revolution jump in an Olympics, helping the United States take the team bronze.
Meanwhile, some believe that Medvedeva, who broke her leg late a year ago, should have won gold.
"If I had the tenacity to do all my jumps in the second half, I'd get that done", Nagasu said. "I didn't think about errors, not about a clean skate", she said.
It wouldn't be a top worldwide women's figure skating competition without its share of controversy, however. I think that Zhenia is her role model in life, in behaviour, in her way to work. There was nothing at all wrong with Medvedeva's skate, but there just wasn't the magic either to which I have grown accustomed.
Chen fell once and had bobbles on other jumps and moves. The women haven't won an individual medal since Sasha Cohen's silver medal in 2006.
"It was fun to go out there and be the team and the player that got us here and that we've worked so hard to be", Shuster said after that game.